Carry a Toon (book) in your pocket
Toon Books, the early-reader comics imprint helmed by Francoise Mouly, is relaunching three of its iPhone apps: Silly Lilly and the Four Seasons, by Agnes Rosensteihl; Jack and the Box, by Art Spiegelman, and Little Mouse Gets Ready, by Jeff Smith. Yes, you can get comics by the creators of Maus and Bone for free! All are worth a look on their own merits, and they also make an excellent distraction should you find yourself in the company of bored, fidgety children.
Of course, the free app is just the start—as soon as you open it up, you get the option to purchase an audio version in English or a variety of other languages.
I looked over the Little Mouse app, and it looked good, although the automated page turns are a little disconcerting. (You can turn that off from the start menu but not once you are reading the book.) All three books were originally published in a landscape format so they fit nicely on the screen, and the resolution is good even when blown up to double size for the iPad. And compared to $12.95 for the hardcovers, the free app is a steal.